Boiler feed water regulating apparatus



Oct. 18, 1932. c. B. ARNOLD BOILER FEED WATER REGULATING APPARATUS 5sneets-sn eet 1 Filed Aug. 8, 1930 ATTORN EY Oct. 18,1932. g, ARNOLD1,883,454

BOILER FEED WATER REGULATING APPARATUS Filed Aug.. 8, 1930 5Sheets-Sheet 2 40 I 54 Z5 Z8 Z7 7' 2.? 3130 3/29 44 6' I&(ENTOR IATTORNEY Oct. 18, c B D.

BOILER FEED WATER REGULATING APPARATUS Filed Aug. 8, 1930 5 Sheets-Sheet3 ATTORNEY Oct. '18; 1932. B, ARN LD 1,883,454

BOILER FEED WATER REGULATING APPARATUS Filed Aug. 8, 1930 5 Sheets-Sheet4 gvzzmn BY I ATTORNEY Patented Oct. 18, 1932 usrrsnsTAr PATENT FFICECHARLES B. ARNOLD, or BROOKLYN, NEW YORK BOILER FEED WATER REGULATINGAPPARATUS Application filed August 8,1930. Serial NO. 473,886.

This invention relates to a boiler feed W ater regulatingapparatusadapted to regulate the supply of liquid to the boiler in such a manneras to maintain the level of the liquid within predetermined limits. 1

Prior feed water regulating devices which are actuated by changes intheliquid level alone are objectionable for the reason that the valves arefirst causedto close when a sudden increase occurs in the rate ofsteaming of-the boiler, since the change is accompanied-by a sudden riseof liquid level in the boiler, and

after the sudden rise of liquid level, the level starts to lower forthereason that the boiler is generating more steam than the valve isaccommodating atthe time. Another undesirable condition to which allfeed water regu lating devices are subjected and for which prior feedwater regulating valves fail to cor; rect' is thatof fluctuations ofpressure in the feed line on the inlet side of the valve. With the rateof steaming of the boiler remaining substantially constant, if. there isan increase of pressure ahead of the valve or inlet,more

' water will be supplied to the boiler than is required. The inventionovercomes the afore said diillculties and provides a device whichoperates to substantially maintain the correct level of liquid in aboiler at all times. 4

An. object of this invention is the provision of a device whichautomatically causes the boiler feed water regulating valve to respondto changes in the rate of steaming of the boiler and changes in feedwater pressure, as well as changes of liquid level in the boiler.

Another object of this invention is to incorporate in a singleself-contained unit a device which when applied to a feed regulatingvalve becomes an lntegral part thereof and l which will automaticallycause the valve to respond to changes in the rate Ofsteaming,

changes in feed line pressure fluctuations and changes in liquidlevel inthe boiler. V

To the accomplishment of the foregoing and such other objects as mayhereinafter appear, this invention comprisesithe construc tion;combination and arrangement of parts her defined in the appended claims,reference being had'to the accompanying drawings formvupper part ofanother form of-my invention -natter described and then sought to be inga part hereof, and which show merely for the purpose of illustrativedisclosure various embodiments of my invention, it beingexpresslyunderstood, however, that various changes may be made in practice withinthe scope of the'claims without digressing'from my inventive idea.

In the drawings I Figure 1 represents a diagrammatic view of a powerplant showing one form of aboiler 0 feed water regulating valve, appliedto the feed waterline of the boiler.

Figure 2 represents a vertical sectional View of one form of the feedWater regulating valve in which interconnected bellows are used tocorrectlypo'sition the valve. Q Figure 3 represents a vertical sectionalview ofanother form of a boiler feed water regulating valve,showing thebellows positioned below the valve. 1

showing another form of my invention in which diaphragms are substitutedfor bellows. Figure 5 i represents a vertical section .view of anotherform of my invention show ing a feed water regulating device includingpistons, the device being applied to a float actuated valve. v V

Figure. 6 is a vertical sectional" view of the which is adapted to besubstituted fort-he upper part includingthepistons shown in i issupplied with liquid by the feed pipe '2 having a feed water'regulatingdevice 3 inserted therein; The usual type of thermostatt is used whichis actuated by changes'of waterlevelin the boiler drum 1.' Thethermostat comprises a tube 5 mounted in a channel element 6, the tubebeing rigidly held at one end as at 7 and communicates with the top andbottom portion of the boiler drum bymeans of tubes or pipes'8 and 9.Pivotally attached to theother Or free end of the thermostattube 5 is alink 10 which has'its other endpivotally connected to a rod 11, therod11 being connected to lever 12 of'the' regulating devicefi. The-steamline OrcOnduit1 3cOm- 100 municates with the top of the boiler drum 1,and is adapted to conduct steam from the boiler drum to super-heater14and from here the steam line 15 conducts the steam to the place ofutilization.

Referring to Figure 2, the regulating device will now be described. Pipe16 is connected and communicates with the interior of the valve casing17, and is provided with a Valve 18. On the discharge side, valve casing17 communicates with the pipe 19pr0- vided with a valve 20. Pipes 16 and19 are connected to and communicate with the interior of the housing 22which comprises three sections 23, 24 and 25, suitably mounted on casing17. Sections 23, 24 and 25 will be described more fully as thedescription of the invention proceeds.

Pipe 16 is connected with top section 23 and is in communication with apassageway .26 formed in the top section and which extends from thecenter of the top section to the outer edge thereof. Communicating withinnerv end of passageway 26, is a downwardly extending passageway 27extending substantially at right angles to the passageway 26. Astationary valve cylinder 28 is threaded into passageway 27 until flange29v abuts the bottom portion of section 23 adjacent the passageway 27.The valve cylinder 28 is provided with an annular groove 30 whichcommunicates with passageway 27 by means of vertical passageway 31formed in the cylinder and a plurality of openings 31 connect-ing thepassageway 31 with the groove 30, and has a sliding lit with a movableb-y- .pass .valve sleeve 32 closed at one end, as at 33-, except for thesmall opening 33, and provided with openings 34 intermediate its ends.The valve cylinder 28 and the valve sleeve 32 are spaced apartlongitudinally so as to per mit relative movement to take place betweenthe parts. When the annular groove '30 of the valve cylinder 28, andopenings 34 of the valve sleeve 32 overlap each other, a by-pass forfluid under pressure therethrough is provided which functions toposition the valve correctly. 1

The closed-end 33 of valve sleeve'32 is pro vided with an opening 3'5into which stem 36 is threaded or otherwise secured. The valve sleeve 32is adapted to rest on plate 37 to which an open ended bellows 38issecured, the bellowsextending upwardly and partial- 1ysurrounding-thevalve sleeve '32 and valve cylinder 28. The top of thebellows 38suitably secured to-an annular plate 39 which is clampedbetween sections23 and 24 of the housing 22 so as to be "hermetically sealed. Section'23 of thehous-ing 22 is provided with a central depression 40; section24 is provided with a central opening 41 which is in alinement withcentraljdepression 40 of sect-i on 23,fand"section 25 is provided with acentral depression 42 which is in al inement with opening 41 anddepression 40, the three sections thereby providing a chamber orcompartment for the parts of the device now being described. Theinterior oi the bellows 38 and depression 40 of section 23 communicatewith a passageway 43 formed in the top section of housing 22 and extending from near the center of top section 23 to the outer edge, thepassageway 43 being on the opposite side of the device with respect topassageway 26. Pipe 19 is adapted to be connected to top section 23 andcommunicates with passageway 43. Interposed between passageway 43 andthe end of pipe 19, is a restricted orifice 44 which operates to createa pressure diiferential on opposite sides thereof. It is to be notedthat the valve 20 may be used to compensate for minor corrections in therestricted orifice 14 and so forms a variable orifice construction. Itis be expressly und rstood, however, that variable orifice such as avalve may be substituted for the fixed orifice The operation of thisorifice will be described more fully when the operation of the inventionis given.

T18 bottom plate 37 is mounted on an integral, apertured spacer member45 provided with a top portion 46 of approximately the same size asplate 37 and a bottom portion 47 of substantially the same size as plate37.

the top and bottom portions being connected by a sleeve portion 48. Thestem 36 is received by the aperture in the spacer member 45. A largebottom apertured plate 49 is clamped and held against bottom portion 47of the spacer member by means of an apertured disk 50, which is threadedon the lower end of stem 36.

Bellows 51 is of a larger diameter than bellows 38, andis attached tothe periphery of bottom plate 49 and extends upwardly and surroundsspacer member 45 and the lowe portion of bellows 38. The top portion ofbellows .51 is attached to an annular plate 52 which is clamped betweensections 24 and '25 of housing '22-so as to be hermetically sealed. Achamber is thus formed surrounding bellows 38 which communicates withpassageway .53 formed in section 24, the passageway .53 extending fromthe central opening 41 in section 24 to the outer ed e thereof. Threadedinto the outer end of passageway 53 is a pipe 54 connected to pipe 19and provided witha valve 55. Ex-

tending downwardly from pipe 54 is another pipe '56 provided with avalve 57, the pipe 56 being connected and in communication with thesteam line 15 to conduct pressure to the interior of-the chamber formedby bellows :51. In this embodiment, bellows 51 has an effective areawhichis twice as large as bellow-s 38, but it is expressly to beunderstood that the invention is not restricted to this ratio.

The lower portion of section 25 is provided with a chamber orcompartment 58, which is in communication with the central depression42, ofsection 25 by means of opening 42, the chamber 58 forming ahousingmeans for the levers to be presently described. The lower end of section25 is provided with a flange 59 which is mounted on the flanged tubularextension 60 ofvalve housing 17. weight (31 which may be used forcounterbalancing purposes. '8 i i o, I

Threaded on the lower end of the stem 86 and contacting with the disk orplate 50 isa member 62. Pi votally connected to the lower end of themember 62, as at the movable fulcrum 68, is a link 64, the other end oflink Get being pivotally connected, as at the 1nov-.

able fulcrum 65, intermediate the ends of an arm 66, which is pivotallyconnected at one end, as at the movable fulcrum 67, to an arm 68 and itsother end to a link 69, Arm 68 is mounted on a fixed pivot 71 in thebottom section 25 of housing 22, the fixed pivot 71 extending throughthe section'25 and being connected .to lever 12' on the eX- terior ofsection 25. Lever 12 is actuatedby changes inliquid level in the boilerand" adjust-s the movable fulcrum 6'? for changes in the liquid level.Link 64 connected to the bellows is operated thereby, and functions toadjust fulcrum 65. Link 66 connected to both movable fulcrums 67' andprovides means for transmitting the combined movement of the twofulcrums to the valve plunger '24, so as to control and regulate themovement of the valve plunger sothat the valve plunger feeds the properamount oi"; water to the boiler. v

Link 69' is connected to a valve rod 72, and

is provided witha counterweight 73 which functions to counterbalance thesyphonic eil'octof the weight of'water in line 56 which weight of waterexerts a force to compress bellows 5]. and also counterbalancethefellect ol any pressure on the underneath side of bellows 51 causedby the head of water in conduit-'2. The lower end of valve rod '12 ispivotally connected to a hollow cylindrical valve plunger open atbothends and 1 vided with spaced prongs75 at itsbottom portion, thevalve plunger being provided with an imperrorate cylindrical portion 76between the upper end and; the prongs 75. Valve plunger T4 is slidablyreceivcd in the annular members 77 the annular portion 79, of valvecasing 17; The valve plungerl l is provided with a flanged top or whichisadapted to be lim' ited in its downward movement by contact -with thetop of screw threaded member 77 Referring now to Figure 8, wnichshows mydevice applied to a bellows actuated, level regulating structure Thebellows 80 is the usual type used in connectionwiththese level Lever-12is provided with a as at 70.

and "Z 8 threaded into lows 80 is connected directly to a valve rod 81which has a plunger 82 provided with two pistons 83, so that theexpansionor contraction of the bellows causes a movement of the valveplunger. Nhen my device is applied as bellows actuated regulator asshown,

changes in the rate-of steaming of th'e'boiler, and changes of feed linepressure, as well as boiler drum water level, are compensated for. Thestructure of bellows 84 and 85 ,and

the correlated parts are similar to the structure already described inconnection wlth Figure 2. In this vmod1ficat1on, however,

there is a slight difference in the valve struc-' ture and the linkagesor interconnections between the. valve and the concentric bellows 8 and85, whlch will now be described. It

is also to be noted that in this modification the bellows 8% and 85 arepositioned beneath the valve and are shown reversed as com,- pared withFigure 2.

Connected to the larger bellows 84, is a member 88 on which is pivotallymounted the link 87, as at the movable fulcrum 87, the link 87 beingpivotally connected, as at the movable fulcrum 88, with a link 88 whichis'fulcrumed, as at the fixed fulcrum 89. The

fulcrum 89 is mounted in the wall of the chamber 90 formed on section 25of housing 22, and extends to the exterior thereof, and has mountedthereon a lever 91 provided with a counterbalance weight 92 similar toweight 73 described in connection with Figure 2. Pivoted on the otherend of link 88,

as at movable fulcrum 93, is a link 93 provided with an arm 94, the arm94 being connected to the valve cage 95 by means of link 96 pivoted, asat 96. The cage 95 is a hollow cylinder open at both ends, and providedwith a plurality of holes 97. The cage 95 is slidably mounted in theannular portion 98 provide-d in the valve tons 88are'reeeived andslidably mounted in the valve cage 95 and by their position permit orprevent the flow of water through the valve housing 99. through linksand levers 87, 88, 93 and 94, adapted to adjust valve cage 95 while Thebellows 84 and 85 liquid level responsive bellows 8O actuates rod 81 andpistons 83 located in valvecage' 95.

Referring now to Figure 4:, a water level regulator is shown whichutilizes a diaphragm the water position phragm, the, diaphragm operatingin the same manner as bellows 80 in Figure 3.

level in the boiler to change the -The rod 100 is connected to a leversystem which operates the valve 101 and 'which will be later described.On the inlet side the valve casing 102 has a pipe 103 which communicateswith the interior of the valve cas housing 99. The pis-' (not shown)which is actuated by' of rod 100 connected to the said diaing and isprovided with a valve 104. On the discharge side, the valve casing 102has a pipe which communicates with the interior of the casing 102 and isprovided with valve 106. Pipes 103 and 105 are connected to, andcommunicate with the interior of a housing 107 which comprises aperturedsection 108 and annular section 109. Pipe 103 is connected with the topsection 108 and communicates with a passageway 110 formed in the topsection, and which extends from the center thereof to the outer edge.section'108 is provided with a central depression 111 which communicateswith passageway 110.

Elongated stationary sleeve 112 is threaded into top section 108 of thehousing 107 and forms a guide for rod 100. The sleeve 112 is providedwith a flange 113 at its lower end which fits into a larger, concentric,stationary sleeve 114, the larger sleeve being threaded with the centraldepression 111 in top section 108. The flange 113 functions to preventthe escape of fluid pressure from the by-pass construction to be laterdescribed.

The stationary sleeve 114 surrounds and is concentricwith elongatedsleeve 112 and is threaded into the lower portion of depression 111 andis provided with openings 115. Surrounding said sleeve 114, and having asliding fit therewith, is an elongated movable sleeve 116 provided withopenings 117. Openings and 117 together with pipes 103 and 105 form aby-pass which conducts iquid from one side of the valve housing 102 tothe other without passing through the valve housing 102. Sleeve 116 isprovided with a flange 118 int'erme'diateits ends and at its lower endis provided with threads 119 adapt-ed to receive a nut 120 for clampingthe spacer elements 121 and 129 for the diaphragms 122 and 123 againstflange 118. These parts will be more specifically described as thedescription of the invention proceeds.

Pipe 105 is connected with section 109 and communicates with theinterior 124 thereof. Interposed between the interior 124 of the section109, and the pipe 105 is a restricted orifice 125 which operates tocreate a pressure differential on opposite sides thereof.

, The diaphragm 122 is clamped between an nular section 109 and annularsection 126. Diaphragm 123 is clamped between annular section 126 andsection 127, the central por tions of the diaphragms being mountedbetween the separable sections 128, 129 and 130 of the spacer 121, thespacer being clamped against the shoulder or flange 118, on the sleeve11 6, by means of the nut 120. The, annular section 126 is provided withan inwardly extending shoulder 1.31, which. limits the upward movementof the spacer section 129. A chamber 133 is, therefore, provided betweenthe two .diaphragms 122 and 123 and the annular section 126. A pipe 134is connected to section 126 and communicates with the passageway 135which extends from the chamber 133 through the section 126 to the outeredge thereof, and is connected to the pipe 105. The pipe 134 is providedwith a valve 136 positioned near the pipe 105. Between the valve 136 andthe section 126 is a pipe 137 which extends downwardly from andcommunicates with pipe 134'and is provided with a valve 138.

Red 100 is provided with a link 139 which is pivotally connected, as atthe movable fulcrum 140, to the adjacent ends of arms 141 and 141, thearms 141 and 141 being pivotally connected, as at the movable fulcrums142 and 143, adjacent the middle thereof by means of links 144 and 145which are pivotally connected, as at the movable fulcrums 146 and 147,to the bottom section 130 of spacer member 121. Pivotally connected, asat the movable fulcrums 148 and 149, to the ends of arms 141 and 141 arelinks 150 and 151 which. are pivotally connected, as at the movablefulcrums 152 and 153, to the ends of arm 154. Link 155 is pivotedintermedi ate the ends of the movable arm 154 and is provided with a rod156 which carries a counterbalance weight 157 and the valve 101. Section127 is provided wi"h an annular portion 158 which extends inwardly andforms an abutment means for the lower section 130 of spacer member 121.The lower portion of section 127 is provided with the chamber 159 whichis adapted to receive the lever system just described. The lower portionof section 127 is suitably secured to the flanged tubular extension 102of valve casing 102.

Referring now to Figure 5 which shows a float type boiler feed waterregulator, 160 designates a valve casing having an inlet 161 and anoutlet 162. A flanged tubular extension 163 extends upwardly from thebottom of the valve casing and is provided at its bottom with ajackscrew 164 which may be used to open the valve. The stem 165 isprovided with spaced pistons 166, 167, which are slidably received inthe valve cage 168 mounted in an annular interior portion 169 formed inthe valve casing 160. The tubular extension 163 is provided with a flatannular portion 170, and has fitted thereon the packing gland 171 inwhich the stem 165 is slidably mounted. A. flange 172 is formed on thetop of the tubular extension 163 and is adapted to be secured to thefloat chamber 173. Pipe 1 74 having a valve 175 connec ed to andcommunicates with the interior of the inlet side of the valve casing160. Pipe 176 provided with valve 177 is connected to end'communicateswith the interior of the outlet side or discharge side of the valvecasing 160.

Flo-at chamber 173 provided with an en larged opening 178 in its bottomwall which is in alinement withthe opening in tubular extension 163 andsurroundsstem 165." The float chamber is provided with holes 17' 9 and179 adapted to receive the necessary connections to a boiler drumrespectively above and below. normal water level. mounied on the floatarm 181 is pivoted at the movable ilulcrum 182, the float arm; beingprovided with a counterweight183. An arm 18-1 connected to stem 165, anda link 185 is pivotally connected to arm 184, as at the. movable fulcrum186, and also to arm 181, as at the movable fulcrum 187, between thepivot 182 andthe' counterweight 183 A link 188 is pivotally connected atits one end to floatarm 181 at the movable fulcrum 182,:and

has its other end 'pivotally connectedto arm 189 which is pivoted at oneend as at the fixed fulcrum 190. The counterweight'190 is provided onthe other end of arm 189. Be: tween link 188 and pivot 190 is a pivotedlink 191 provided with a stem 192 which extends through the opening 193in t he'top of the fleatrchamber and into the housing 194 com prisingtwo sections, namely, atop section 195, and a bottom section 196suitably secured together. V y

A'tlange 197 is provided at the bottom of lower section196 whichismounted ,on the float chamber surrounding the opening 198.

1 nnular abutment 198 formed on theinof bottom section 196 surrounds theA flange 199 is provided on the tenor stem 192.

upper part operates with the flange 200 on top SBCJHOD 195 for securingthe parts together. Stem 192 is connected to the lower large piston 201received in the cylindrical portion 202 formed in the upper portionofthe bottom ion -al with a smaller upper piston 203,

slidably received in a cylinderport on 204 formedin the lower portion oftop section The two pistons are connected by an integral. sleeve portion205, the pistons forming a structure open at the top and closed at thebottom. The cylinder portion 202 of the lower section 196 is providedwith an annularintegral flange 206 which limits the downward movementofthe lower piston 201. The lower piston 201 has anjarea twice that ofpiston 203, but it is to be expressly understood that the relative areasof the pistons may be varied.) Float arm 181'sw1ngs on fulcrum 182 asa'pivot toopen and close the valve, andlink 188 being connected withpistons 201 and 203, changes the. position of fulcrum 182 foreach changeinjthe condi tions existing in theboiler. In this'way tl" be r is fedthe correctlamount of water n r varying conditions and a better opera:tionis obtained. f r V The structure for applying pressures to thepistons is similarto the-structure herei tofore described in connectionwith the bel- The float 180.

of lower section 196 which co- 196. The lower piston 201 is formed 1connected to a pipe 215 adapted to be connetted L the stream line andconductpressureto the cylinder 202. The principle of operationv of thismodification is the sameas the ones previously described. The pistonslike the bellows of the other forms are adapted to change the fulcrum ofthe valve. j

Referring now to Figure 6 which shows'a top portion including' bellowswhich is adapted 'to-be substituted for the top portion of Figure 5, avalved inlet pipe'225, and a valved outlet pipe 226 are provided. Thevalved pipe 227 is adapted to conduct pressure into the lower bellows,the structure being similar to the previous structures described. Ahousing 228 is provided comprising a topsection 229, and the bottomsection 280. The two sections 229 and 2301 are separated by a flangedplat-e 231jon which the 1 suitably secured together as} by screws 232;

I 1 l The bottom section 230 of hous ng 228 is secured to thefloatchamber .233. Rod 234 extends through the packing gland 235 provded inthe bottom portion of the bottom Y section 230. The bottom ofsection 230 adjacent the gland 235 is provided with openings n n v l u23(101 admitting pressure to the exterior of che lower bellows. Achamber 238 is formed in thebottem section 230 and is adapted to 6 forma. housing for the lower bellows 239. i

' late 240 is secured to the rod 234 and has bellows. 239 secured to thetop facethereof.

A top plate 241 is provided, the two plates 240 and 241being connectedby bolts 242 which pass through. enlarged openings 242 formed in theflanged plate 231.-- The top of bottom bellows 239 is secured tothebottom of flanged plate 231, the'plate' being provided with openings andpassageways 243 and244 whlch communicate with the interior of the bottombellows 239. Passageway 243 con- 7 necte'dto the pipe 227 which isconnected to thesteam-line and passageway 234 communicatesiwith theoutlet valve'pipe 226 by a valved pipe 245.

- 1 Extending upwardly from the plate 241 is a rod 246which isthreadedly engaged therewith at itsbottom end andwhieh extends at 7 itsother end through the plate 247 to whichv the top bellows 248 issecured. Nuts 249 are threaded on the rod *on'opposite sides of theplate247 and are adapted to clamp the plate 247 with the bellows 248 toa, rod 246. The

bottom of bellows 248 is mounted on an annular fiat plate 250 which isclamped between the flanged plate 231 and the top section 229 of thehousing 228. The interior of bellows 248 e'ommunicates with the exteriorof bellows239 by means of the opening in the annular plate 250 and theenlarged openings 242" formed in the flanged plate 231. It will be notedthat in this modification, the bellows have substantially the sameareas.

Top section 229 of housing 228 is formed @with a cutaway portion 252 toform a chamberwhich receives a stationary sleeve 253, the sleeve beingheld in position by the nut 254 threaded into the lower end of thecutaway portion 252; The stationary sleeve is provided with a pluralityof holes 255 intermediate its ends; The passageway 256 formed in the topsection 229 connects the inlet pipe 225awith the interior of top section229, the heles 255 formed in the sleeve and the passageway 256 being inalinement.

Slidably received in the valve sleeve to have a sliding fit therewith,is a movable valve plunger 257 which is secured to,and forms acontinuation of, the rod 246, the valve plunger being provided with aplurality of openings 258 which are adapted to edoperate withtheopenings 255 of the valve sleeve to permit the by-pas sing of liquid,whereby automatic regulation of the valve is obtained. The bottom of thevalve plunger is provided with openings 259 which permit communicationbetween the inlet pipe 225 and the exterior of top bellows 248 whenopenings 258and 255 arev in alinement. The top section 229 is providedwith a passageway 260 having a restricted opening 261 simi lar to therestricted openings described in connection with the other forms of theinvention, passageway 260 being in communication with the valved outletpipe 226.

Referring now to Figure 2, the operation of the device will bedescribed. Assume that valve 55 is closed and that valves 18, 20 and 57are open. In the above description I have included the counterweight 73in order to counterbalance the negative head of water in pipe 56. If thevalve 3, drum 1, and superheater outlet 15 are all at the sameelevation, the heed for a counterweight is eliminated. For the purposeof describing my invention, I will, therefore, assume that all of theseabove naine'd parts are at the same elevation and dispense with thecounterweight. Assume further that the boiler is just starting togenerate an infinitely Steam. Under these conditions,'the required feedwater supply to the boiler willbe infinitely small, the feed valveplunger .7 6 will be requiredto assume an almost closed position inthedownward direction and the pressure of the steam at the superheater ofthe boiler (or some point in the steam line small amount of pressure, itwill be noted that the differential pressure between the interior andexterior of bellows 51 will be equal to zero. In order that equilibriummay be established between the forces exerted upon bellows 38 andbellows 51 under these conditions, it is neces- 3 sary that thedifferential pressure between the interior and the exterior of bellows38 be also equal tozero. This condition requires that the pressures onthe exterior and interior of bellows 38 be equal and that there be noflow through orifice 44 and by-pass lines 1-3 and 19, thus permittingthe interior of bellows 38 to be subjected to the same pressure asthatat the outlet of the level regulating valve 17, which is virtuallyequal to drum pressure, and as above pointed out this drum pressure isequal to the pressure at the superheater out let. With no flow throughthe orifice 44, it is necessary that the auxiliary by-pass valve sleeve32 be in a 'closed. position. It will be noted that if valve sleeve 32were open it would be immediately closed the pressure created ahead oforifice 44, acting to expand bell0ws38. Thisconditionlocates theposition regulator and fulcrum 65 in this extreme travel position in adownward direction to close the level regulating valve plunger 76.

If therate 5f steaming of the boiler increases, the pressure of thesteam at the superheater outlet or some point in the steam line dropsbelow that maintained in the boiler drum, and since the interior ofbellows 51 is subjected to the pressure of the superheater, and sincethe superheater pressure has now decreased, bellows 51 will compress.Due to the direct connection between bellows 51 and valve sleeve 32,compression of bellows 51 will cause the by-pass valve sleeve 32 to bemoved upward in anopening direction and thus permit waterto beby-passejd from the inlet side of the valve housing 17, through pipe 16,through the interior of bellows 38, through orifice 44 and to thedischarge side of the valve housing 17 through pipe 19. The flow thusefi'ected increases the. pressure on the interior of bellows 38 aboveboiler drum pressure by an amount equal to the pressure drop acrossorifice 44 plus the pressure drop through the connecting line 19. Sincethe exterior of bellows 38 is subjected to the pressure existing inthesup'erheater, bellows 38 is subjected to a differential pressureequal substantially to the pressure drop through the orifice 44 plus thepressure drop of steam in the superheater. hen the differential pressureto which bellows 38 is subjected is equal to twice the differentialpressure across bellows 51, equilibrium is established, and the deviceassumes a definite position for this new steaming rate.

When the load on a boiler is increased two conditions result, the waterlevel in the drum is caused to rise momentarily and thepressure dropthrough the superheatcr is increased. By means of thermostat '5,(together with levers l0 and 11, arms Hand 68, fulcrum 67 in arm 68),lever 66 is caused to be moved in a direction to close valve plunger 76when the water level rises in the drum. However, as pointed out above,fulcrum 65, inthe other end of lever 66, is caused to move in a direction to open valve plunger 76. The resultant movement of plunger 'Zlidepends therefore upon the magnitude of the movements of each fulcrum.Plunger T6 istnus caused toopen rather than close despite theundesirable rise in water level caused by the swelling of the water inthe boiler during an increase in boiler load. For a decrease in load theop posite results, namely, the valve 15 caused to close despite thislowering of the water level tending to open the valve.

The device also functions to compensate again established. A closing ofthe by-pass valve also closes the valve 76 provided the position of arm12 remains unchanged. It is thus noted that the main valve is caused toclose down the proper amount when there is an increase of feed linepressure'or vice versa instead of requiring that this cprreetion be madethrough the mediunrofa change in water level.

lhe principle of operat on of the other forms of the invention is thesame as the one described in connection with Figure 2. In

all cases the bellows, diaphragms or pistons co-operate with a liquidlevel responsive device to accurately position the valve plunger so asto deliverthecorrect amount of'water to the boiler under all conditions.It is to be expressly understood that bellows, dia

' phragms and pistons canbe used in any of the forms shown andtherelative sizes of'the bellows, diaphragms or pistons in eachembodiment may be varied. .Each of the forms is adapted to be used witha po-werplant as shown in Figure 1,7but it is to, be expresslyunderstood that they are not restricted to use with the power plantshown.

It will be apparent from the-above descrip tion that a deviceconstructed according to my-invention is responsive to changes in therate ofsteaming of a boiler, changes in water level,'and fiuctuations infeed line pressure, and that due to the movable pivots or fulcrums,thedevice is actuated .by their combined movements to supply water to theboiler in accordance with the amount of water required by the boiler atany time.

' What I claim is: 1

1. In combination, a boiler, a liquid conduit and a steam conduitconnected therewith, a valve casing in said liquid conduit, a valve insaid valve casing, ahousmg mounted on said casing andprovided with anopening which communicates with the discharge side of said casing, aplurality of interconnected pressure responsive means in saidhousing, Vmeans including a restricted orifice connecting one side of said housingto the outlet side "of the valve casing and to one side of a pressureresponsive means and means connecting the otherside of the housing tothe inlet side of the valve casing and the same side of said pressureresponsive means, by-pass valve means operated by all the pressureresponsive. 'means for controlling the pressure of the liquid 111 thehousing on said s de ofsaid pressure responsive means for the purpose ofeffecting response to feed .line pressure, means. for conducting steampressure from the steam conduit between the pressure responsive meansfor the purpose ofeli'ecting response to steam flow the other sideof theother pressure responsive means being exposedto the pressure existingin'the discharge side of valve casing, means for connecting saidpressure means to said valve, and means responsive to liquid levelchanges in tneboiler said means zoo-operating with the pressureresponsive means to operate the valve.

' i. In combination, a boiler, a vapor conduit and a liquid conduitconnected therewith, valve means in said liquid conduit, means forby-passing liquid around the valve means to the bo1ler,;an auxiliaryvalvem said by-passmeans,a restricted orifice in said by-pass means onthe discharge side of the auxiliary valve, means for operating theauxiliary valve in response to changes in steam flow from the boiler,said means including interconnected diaphragms, one face of onediaphragm being subjected to the pressure of. liquid at the outlet sideof the valve,

and the other face being subjected to a'pressure existing in the vaporconduit, the other diaphragm having one face adjacent the face of thefirst diaphragm'exposed to the pressure existing in the vapor conduit,and having. its other face exposed to pressure-exist ing between theauxiliary valve and the restricted orifice, means for connectingsaiddiaphragms to said valve means, and means responsive to liquid levelchanges in the boiler, said means cooperating with the pressureresponsive means to operate the valve.

3. In combination'with a boiler, a vapor conduit and a liquid conduitconnected to said boiler, a valve casing in said liquid conduit, a valvein said valve casing, a housing on said casing and in communcation withsaid boiler, interconnected pistons in said housing, by-pass meansprovided. with valve for conducting and exerting a liquid pressure onone of the pistons and means for connecting the pistons to the valve,the amount of water passing through the bypass means being substantiallydirectly proportional to the amount of steam leaving th boiler.

4:. In combination, a boiler, a steam conduit and a water conduitconnected therewith, a regulating valve in said water conduit, means forbypassing liquid from the inlet to the outlet side of said regulatingvalve, a bypass valve in said by-pass means, a restricted orifice on thedischarge side of said by-pass valve in the by-pass means, meansresponsive to changes in the rate of steam flow, means co-operatirn withsaid steam flow responsive means and to thediiicrential pressure acrosssaid ori ice adapted to actuate the by-pass valve, means for actuatingthe re 'ulatin valve in ponse to changes in position of the lay-passvalve and means responsive to changes of water level in the boiler andco-opcrating with said, last-named means for actuating the regulatingvalve.

5. In combination, a boiler, a steam conduit therefrom, a water conduitthereto, valve means in said water conduit, a by-pass means around saidvalve means, a by-pass valve in said by-pass means, a restricted orificeon the discharge side of said lay-pass valve in the by-pass means, meansresponsive to the difference of the pressure in the boiler and thepressure at some point in the steam conduit to actuate said by-passvalve, means responsive to the diilerential pressure across the strictedorifice in the by-pass means to position the bypass valve, means foractuating the valve means in the Water conduit in response to changes inposition of the by-pass valve, and a co-operating means responsive tochanges or" water level in the boiler for also actuating the valvemeansin the water con duit. V

6. In combination, a boiler, a steam conduit therefrom, a steamsuperhcater in said steam conduit, Water-conduit to said boiler, valvemeans in said water conduit, b J-pass means around said valve means,bypass valve in said icy-pass, a restricted orifice on the dischargeside of said by-pass valve in the by-pass means, means responsive to thedifferential pressure across the steam superheater in the steam conduitto actuate said bypass valve, means responsive to the differentialpressure across the restricted orifice in the by-pass means to positionthe lay-pass valve, means for actuating the valve means in responsivethe water conduit in response to changes in position of tne bypassvalve, and a co-operating means responsive to changes oi water level inthe boiler for also actuating the valve means in the water conduit.

7. In combination, a boiler, a steam conduit therefrom, a Water conduitthereto, valve means in said water conduit, bypass means around saidvalve means, a by-pass valve in said by-pass, a restricted orifice onthe discharge side of said by-pass valve in the bypass means, meansresponsive to the differential pressure across the restricted orifice inthe bypass means to actuate said bypass valve, means responsive to therate of steam "low to position the by-pass valve, means for actuatingthe valve means in the water conduit in response to changes in positionof the by-pass valve, and a co-operating means responsive to changes ofwater level in the boiler for also actuating the valve means in theWater conduit.

8. In combination, a boiler, a liquid conduit and a steam conduitconnected therewith, a valve casing in said liquid conduit, a valve insaid valve casing, a housing mounted on said casing and provided with anopening which communicates with the discharge side of said valve casing,interconnected pressure responsive means in said housing, meansconnecting one side of said housing to the inlet side of the valvecasing and to one side oi a pressure responsive means, and meansincluding a variable orifice construction connecting the other side ofthe housing to the outlet side ofthe valve casing and the same side ofsaid pressure responsive means, bypass valve means operated by all thepressure responsive means for controllingthe pressure of liquid inthehousing on said side of said pressure responsive means, means forconducting steam pressure from the steam conduit to a point'betweenthepressure responsive means, the other side of the other pressureresponsive means being exposed to the pressure existing in the dischargeside of the valve casing, means for connecting said pressure responsivemeans to and for the purpose of actuating said valve, and a co-operatingmeans responsive to changes of Water level in the boiler for alsoactuating said valve.

9. In combination, a boiler, a liquid conduit and a steam conduitconnected therewith, a valve casing in said liquid conduit, a valve insaid valve casing, a housing mounted on said casing and provided With.an opening which communicates With the discharge side of said valvecasing, two interconnected pressure responsive means in said housing,means connecting one side of said housing to the inlet side of the valvecasing and to one side of a pressure responsive means, and meansincluding a restricted orifice connecting the other side of the housingto the outlet side of the valve casing and the same side of saidpressure responsive means, by-pass valve means operated by all thepressure responsive means for controlling the pressure of liquid in thehousing on said side of said pressure re- 7 sponsive means, means forconducting'steam pressure from the steam conduit between the 10. Incombination, a

boiler, a steam conduit therefrom, a liquid conduit thereto, a

valve casing in said liquid conduit, a movable valve cage in said valvecasing,'a valve'piston in said movable valve cage, means for operatingsaid valve piston in response to changes of Water level in the boiler,and a means for operating said valve cage in responseto changes in therate of steaming of the boiler, said means comprising a means forby-passing liquid from the inlet to the outlet side of saidvalve casing,a by-pass valve in said by-pass means, a restricted orifice insaidby-pass means in the discharge sideof said bypass valve, means foroperating the by-pass valve, said means including interconnectedpressure responsive devices, one face of one pressure responsive devicebeing subjected to the pressure at the outlet side of the valve casing,and the other face being subjected to the pressure existing at somepoint in the steam conduit, the other pressure responsive means havingone face adjacent the face of the first pressure responsive meansexposed; to the pressure existing at the samepoint in the steam conduit,and having its other face exposed to the pressure existing'between theby-pass valve and the restricted orifice, and means for connecting saidpressure responsive devices to the movable valve cage.

11. In combination, a boiler,fa steam con-I duit therefrom, a Waterconduit thereto, a

regulating valve in said water conduit, a bypass means for by-passingliquid from the inlet to the outlet side of said regulating valve, aby-pass valve in said by-pass, a re stricted orifice in the dischargeside of said by-pass valve in the by-pass means, means responsive tochanges in the steam flow to.

actuate said bypass valve, means responsive to the differential pressureacross the restricted orifice to position the by-pass valve so as toregulate the flow of liquid through the bypass valve and orifice in asubstantially fixed ratio to the rate of steam generation of the boiler,means for actuating the regulating with said last named means for valve.in response to changes in position of the bypassi'valve, and aco-operating means responsive to changes of water level in" the boilerfor also actuating the regulating valve. l2I-In'combination, a boiler,a' steam conduit therefrom, a Water conduit thereto, a a

valve casingin' said ater conduit, a valve "means in said'val've casing,means comprising links and. levers connected to said valve means,'saidlinks and-levers being actuated in accordance with changes in Waterlevel in the boiler about a'mova ble fulcrum, means for actuating saidmovable fulcrum in response to changes in the, amount of steam flowingthrough-the steain conduit, said means comprising a by-pass meansfor'by-passing liquid from the: inlet to the discharge side of the valvecasi n'g,'a by-pass valve-insaid bypass means,.a restricted orificeonthe discharge side. of said fby-pass valve in the by pass means, meansresponsive to the differential pressure :between the boiler and. somepoint in the steam conduit connected to and forthe purpose of actuatingsaid by-pass valve, means for conducting said differential steampressureto opposite sides of said responsive means, means responsive tothe differential pressure across the restricted orifice also connectedto the by-pass valve for the purpose of positioning said by-pass valve,means for conducting s'aid orifice difierential pressure to oppositesides of said second responsive means, and means for connecting theby-pass valve and its interconnected pressure responsive means to theaforementioned movable fulcrum. p v

' 13. In combination,a boiler, a steam conduit and a Water conduitconnected therewith, a regulating valve in said Water conduit, means forby-passing liquid from the inlet to v ce the outlet side of saidregulating valve, a bypass valve in said by-pass means, a restrictedorifice on the discharge side of said by-pass valve in said by-passmeans, means responsive to the difierential pressure across said orificeadapted toactuate said by-pass valve, means adapted to actuate theregulating valve in response to changes in position of said by-passvalve, and means responsive to changes of Waterlevel in the boiler andco-operating regulating valve.

14. In combination, a boiler, a steam conactuating the meansforby-passing liquid from the inlet to the outlet side of saidregulating valve, 8.

by-pass valve in said by-pass means, a restricted orifice on thedischarge side of said 'by-pass valve in said by-pass means, meansresponsive to changes in the steam flow,

means co-operating with said steam flow responsive means and responsiveto the difierential pressure across said orifice adapted to actuate saidby-pass valve, and means for all) August,,l930.,

fio 138 v actuating said regulating valve in responsej to changesinposition ofsaidiby-passvalve.

.15; Inicombi'nation with a boiler, ,a ,vaporeiondui'tandjaliquidconduit,connecteditosaidV i I boiler, avalvecasinginsaid'liquidconduit, a.

Valve in said Valve casing, a housing on said casing andincommunioationwith said boiler,

interconnected pistons insaidlhousing, means for connectlng sald pistonstosaid valve,jbypassnieans; provided. Wlth, an, auxillary valve forconductingand exertinga liquid pressure on one of said pistons, meanswhereby pressure inc-said Vapor conduit may be transmitted to the otherpiston to actuate said auxiliary Valve so that the amount of Waterpassing through said by-pass means is substantially directlyproportional to theamount of steam leaving; the boiler.

v In testimony that I elaimlthe foregoing, I

hayejhereunto set myrhand this 6th day of oHARLEs B. ARNOLD;

